Ch 14 Work Sampling

# Ch 14 Work Sampling - Work Sampling 11 Work Sampling...

This preview shows pages 1–7. Sign up to view the full content.

11 Work Sampling

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
22 Work Sampling Advantages Ø Does not require continuous observation over a long period of time Ø Clerical time is diminished Ø Total work hours expended by analyst usually much fewer Ø Crew operations can readily be studied by a single analyst
33 Theory of Work Sampling Ø Binomial Distribution l (p + q)n = 1 l Where: l p = probability of occurrence l q = 1 – p = probability of non-occurrence l n = number of observations Ø As n becomes large, the Binomial Dist can be approximated by the Normal Distribution l μ = p l σ2 = (pq/n)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
44 Fig 14-3 Cumulative percentage of running time
55 Work Sampling- Sample Size σ p = (pq/n).5 = (p(1-p)).5 Let Z α /2 σ p be the acceptable limit of error ε at a (1- α )100% confidence error, where: ε = Z α /2 σ p = Z α /2 ( pq/n).5 Solving for n: n = Z2 α /2 pq/ ε 2

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
66 Example- Sample Size Determination A work sampling is examining 10 machines at each observation point to find the % idle time. After 25 observations (250 data points) the value
This is the end of the preview. Sign up to access the rest of the document.

## Ch 14 Work Sampling - Work Sampling 11 Work Sampling...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online